DOOM Retro v2.4.3 is now available. It may be downloaded here, and its release notes are as follows:

Optimizations have been made to further improve the overall performance and stability of DOOM Retro.

The ENTER key may now be used as an alternative to the Y key when responding to messages requiring a yes/no answer.

When the player dies, the amount of health displayed in the widescreen HUD will no longer always be zero. It will instead often be a negative number to indicate how much damage was inflicted upon the player in order to kill them.

A bug has been fixed whereby the ammo and armor CVARs could be set to negative values and cause a crash.